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Annotation of embedaddon/php/ext/hash/hash_crc32.c, revision 1.1

1.1     ! misho       1: /*
        !             2:   +----------------------------------------------------------------------+
        !             3:   | PHP Version 5                                                        |
        !             4:   +----------------------------------------------------------------------+
        !             5:   | Copyright (c) 1997-2012 The PHP Group                                |
        !             6:   +----------------------------------------------------------------------+
        !             7:   | This source file is subject to version 3.01 of the PHP license,      |
        !             8:   | that is bundled with this package in the file LICENSE, and is        |
        !             9:   | available through the world-wide-web at the following url:           |
        !            10:   | http://www.php.net/license/3_01.txt                                  |
        !            11:   | If you did not receive a copy of the PHP license and are unable to   |
        !            12:   | obtain it through the world-wide-web, please send a note to          |
        !            13:   | license@php.net so we can mail you a copy immediately.               |
        !            14:   +----------------------------------------------------------------------+
        !            15:   | Authors: Michael Wallner <mike@php.net>                              |
        !            16:   |          Sara Golemon <pollita@php.net>                              |
        !            17:   +----------------------------------------------------------------------+
        !            18: */
        !            19: 
        !            20: /* $Id: hash_crc32.c 321634 2012-01-01 13:15:04Z felipe $ */
        !            21: 
        !            22: #include "php_hash.h"
        !            23: #include "php_hash_crc32.h"
        !            24: #include "php_hash_crc32_tables.h"
        !            25: 
        !            26: PHP_HASH_API void PHP_CRC32Init(PHP_CRC32_CTX *context)
        !            27: {
        !            28:        context->state = ~0;
        !            29: }
        !            30: 
        !            31: PHP_HASH_API void PHP_CRC32Update(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
        !            32: {
        !            33:        size_t i;
        !            34:        
        !            35:        for (i = 0; i < len; ++i) {
        !            36:                context->state = (context->state << 8) ^ crc32_table[(context->state >> 24) ^ (input[i] & 0xff)];
        !            37:        }
        !            38: }
        !            39: 
        !            40: PHP_HASH_API void PHP_CRC32BUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
        !            41: {
        !            42:        size_t i;
        !            43:        
        !            44:        for (i = 0; i < len; ++i) {
        !            45:                context->state = (context->state >> 8) ^ crc32b_table[(context->state ^ input[i]) & 0xff];
        !            46:        }
        !            47: }
        !            48: 
        !            49: PHP_HASH_API void PHP_CRC32Final(unsigned char digest[4], PHP_CRC32_CTX *context)
        !            50: {
        !            51:        context->state=~context->state;
        !            52:        digest[3] = (unsigned char) ((context->state >> 24) & 0xff);
        !            53:        digest[2] = (unsigned char) ((context->state >> 16) & 0xff);
        !            54:        digest[1] = (unsigned char) ((context->state >> 8) & 0xff);
        !            55:        digest[0] = (unsigned char) (context->state & 0xff);
        !            56:        context->state = 0;
        !            57: }
        !            58: 
        !            59: PHP_HASH_API void PHP_CRC32BFinal(unsigned char digest[4], PHP_CRC32_CTX *context)
        !            60: {
        !            61:        context->state=~context->state;
        !            62:        digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
        !            63:        digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
        !            64:        digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
        !            65:        digest[3] = (unsigned char) (context->state & 0xff);
        !            66:        context->state = 0;
        !            67: }
        !            68: 
        !            69: PHP_HASH_API int PHP_CRC32Copy(const php_hash_ops *ops, PHP_CRC32_CTX *orig_context, PHP_CRC32_CTX *copy_context)
        !            70: {
        !            71:        copy_context->state = orig_context->state;
        !            72:        return SUCCESS;
        !            73: }
        !            74: 
        !            75: const php_hash_ops php_hash_crc32_ops = {
        !            76:        (php_hash_init_func_t) PHP_CRC32Init,
        !            77:        (php_hash_update_func_t) PHP_CRC32Update,
        !            78:        (php_hash_final_func_t) PHP_CRC32Final,
        !            79:        (php_hash_copy_func_t) PHP_CRC32Copy,
        !            80:        4, /* what to say here? */
        !            81:        4,
        !            82:        sizeof(PHP_CRC32_CTX)
        !            83: };
        !            84: 
        !            85: const php_hash_ops php_hash_crc32b_ops = {
        !            86:        (php_hash_init_func_t) PHP_CRC32Init,
        !            87:        (php_hash_update_func_t) PHP_CRC32BUpdate,
        !            88:        (php_hash_final_func_t) PHP_CRC32BFinal,
        !            89:        (php_hash_copy_func_t) PHP_CRC32Copy,
        !            90:        4, /* what to say here? */
        !            91:        4,
        !            92:        sizeof(PHP_CRC32_CTX)
        !            93: };
        !            94: 
        !            95: /*
        !            96:  * Local variables:
        !            97:  * tab-width: 4
        !            98:  * c-basic-offset: 4
        !            99:  * End:
        !           100:  * vim600: sw=4 ts=4 fdm=marker
        !           101:  * vim<600: sw=4 ts=4
        !           102:  */